Stuck at Zephyr while trying to jiump on the wall to reach seed

[SHREDDER]

On zephyr level i have found the missing animalls an now iam on the seed missions. But i am stuck at 12:55 https://www.youtube.com/watch?v=HiNZLkJMeII

I dont know how he in the video reached the wall but i jump again and again and spyro cant reach it why?

[Terepin]

When Professor gives you seed, take it, exit the area, go left, down the stairs and use the seed in the corner to get the second seed.